How do you read 真牡蠣?

真牡蠣 is read まがき (Magaki).

真牡蠣 (Magaki)

Pacific oyster

真牡蠣 (まがき, Magaki) is Pacific oyster — a Japanese food (water animals).

Magaki refers to the Pacific oyster ( Magallana gigas ). Kaki refers to oysters in general.